The objective is to reach the chest that is on top of a rock pillar on the floor down below (visible from the starting ledge). The pillar is accessible only via a jump from the rocks north of it.

Follow the left wall and jump to the next platform below (one level below the starting ledge).

Follow the left wall again and jump to the next platform below. This one is guarded by a Vampire Bat.

Keep following the platform along the left wall (you should pass two more Vampire Bats). At the end of the platform, drop to the small rock ledge below it (the one with empty space on two sides) and turn around.